If 30 percent of the bases in a double-stranded DNA molecule are T, _______ percent must be G.
A) 20
B) 30
C) 40
D) 50
E) 60

Question

Quizplus · Accepted Answer

In a double-stranded DNA molecule, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). If 30% of the bases are T, then 30% must also be A, since A pairs with T. This accounts for 60% of the bases, leaving 40% to be divided equally between C and G. Therefore, 20% of the bases must be G.

If 30 Percent of the Bases in a Double-Stranded DNA